CS8156YTVA5 ON Semiconductor, CS8156YTVA5 Datasheet - Page 8

• Manufacturer Part Number: CS8156YTVA5
• Description: IC REG LDO 12V/5V VERT TO220-5
• Manufacturer: ON Semiconductor

Specifications of CS8156YTVA5

• Regulator Topology: Positive Fixed
• Voltage - Output: 12V, 5V
• Voltage - Input: 6 ~ 26 V
• Voltage - Dropout (typical): 0.6V @ 750mA, -
• Number Of Regulators: 2
• Current - Output: 750mA, 100mA
• Current - Limit (min): 750mA, 100mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: TO-220-5 (Bent and Staggered Leads)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: CS8156YTVA5OS

appear. Record the values of load current and ESR that cause
the greatest oscillation. This represents the worst case load
conditions for the regulator at low temperature.
Step 4: Maintain the worst case load conditions set in step
3 and vary the input voltage until the oscillations increase.
This point represents the worst case input voltage
conditions.
Step 5: If the capacitor is adequate, repeat steps 3 and 4 with
the next smaller valued capacitor. A smaller capacitor will
usually cost less and occupy less board space. If the output
oscillates within the range of expected operating conditions,
repeat steps 3 and 4 with the next larger standard capacitor
value.
Step 6: Test the load transient response by switching in
various loads at several frequencies to simulate its real
working environment. Vary the ESR to reduce ringing.
Step 7: Raise the temperature to the highest specified
operating temperature. Vary the load current as instructed in
step 5 to test for any oscillations.
ESR is found for each output, a safety factor should be added
to allow for the tolerance of the capacitor and any variations
in regulator performance. Most good quality aluminum
electrolytic capacitors have a tolerance of ±20% so the
minimum value found should be increased by at least 50%
to allow for this tolerance plus the variation which will occur
at low temperatures. The ESR of the capacitors should be
less than 50% of the maximum allowable ESR found in step
3 above.
other output.
Calculating Power Dissipation in a
Dual Output Linear Regulator
regulator (Figure 20) is
where:
permissible value of R
P D(max) + V IN(max) * V OUT1(min) I OUT1(max) )
Once the minimum capacitor value with the maximum
Repeat steps 1 through 7 with C
The maximum power dissipation for a dual output
V
V
V
I
application,
I
application, and
I
I
Once the value of P
OUT1(max)
OUT2(max)
Q
OUT(max)
IN(max)
OUT1(min)
OUT2(min)
is the quiescent current the regulator consumes at
V IN(max) * V OUT2(min) I OUT2(max) ) V IN(max) IQ
is the maximum input voltage,
.
is the minimum output voltage from V
is the minimum output voltage from V
is the maximum output current, for the
is the maximum output current, for the
R QJA +
ΘJA
D(max)
can be calculated:
150°C * T A
is known, the maximum
P D
3
, the capacitor on the
http://onsemi.com
OUT1
OUT2
(1)
(2)
CS8156
,
,
8
package section of the data sheet. Those packages with
R
the die temperature below 150°C.
dissipate the heat generated by the IC, and an external
heatsink will be required.
Heat Sinks
package to improve the flow of heat away from the IC and
into the surrounding air.
outside environment will have a thermal resistance. Like
series electrical resistances, these resistances are summed to
determine the value of R
where:
R
are functions of the package type, heatsink and the interface
between them. These values appear in heat sink data sheets
of heat sink manufacturers.
** C
* C
ΘJA
ΘJA
The value of R
In some cases, none of the packages will be sufficient to
A heat sink effectively increases the surface area of the
Each material in the heat flow path between the IC and the
R
R
R
R
V
IN
ΘJC
ΘCS
ΘSA
ΘJC
1
2,
’s less than the calculated value in equation 2 will keep
, it too is a function of package type. R
is required if the regulator is far from power supply filter.
C
0.1 µF
C
Figure 20. Dual Output Regulator With Key
1
3
= the junction−to−case thermal resistance,
appears in the package section of the data sheet. Like
*
= the case−to−heatsink thermal resistance, and
= the heatsink−to−ambient thermal resistance.
required for stability.
I
IN
Figure 21. Test & Application Circuit
Performance Parameters Labeled.
R QJA + R QJC ) R QCS ) R QSA
ENABLE
ΘJA
can be compared with those in the
Regulator
CS8156
Control
Features
ΘJA:
GND
Smart
V
IN
I
Q
V
V
OUT1
OUT2
I
I
OUT1
OUT2
ΘCS
+
+
and R
V
V
OUT2
C
22 µF
C
22
OUT1
2
3
**
**
µF
ΘSA
(3)